Sack sweing machine



F. EBERT 1,967,527

SACK SEWING MACHINE Filed Aug. 29, 1952 5 shee*assheet 1 Jilly 24, 1934.

July 24, 1934.

EBERT SACK SEWING MACHINE Filed Aug. 29, 1932 I5 Sheets-Sheet 2 Jufiy 4 E934. F. EBERT SACK SEWING MACHINE I Filed Aug. 29, 1 932 3 Sheets-Sheet 3 Patent July 24, 1934' I v issue? sAo x as, r m- I Fritz Oberfiderfi-om-Neekan to Apmicnua smu :9, e932,, enial m,- mm

member H, lest 9 (CL 112- 11;

7 Known seek sewing machines eomfiarise e.eon-= veyor device for the filled sack and ase hear} both driven througlztelutehes from s. commen slzett in such manner thet-firstithe. clutch tor driving the conveyor device and then the clutch for the sewing device is engaged, and the v ate the'eluteloes.

- eouwol meer.

disengaging prooess takes place in the reverse sequence. I V i In lmown ces the clutches are arranged one der the other one vertical shaft, -must be raised! to e more or less considerable distance, em. ere located remotely from the base plate. has the dvsntege that, on the one hand, greater force must be applied to operate the clutches and, on member hand, the disteuee of the displayed masses from the supporting stirieee oi the machine is so large thet consiolexslsle esellletioms take pleee amt the rigidity of the w ohiue is preiuiiieiellv effected. i

An object of the pres/set invention is to me time to e mlrniznmm the effort required tan/ eper oiijeet oi thepreseut invention is to reduce vibretiou end improvetlie rigidity oi me,

eloinee'oi the type to whieh time inveutieu rel-steer Aemreliog to the present invention the. eon vevor elutelreud the sewing heed clutch in sect: sewing; eases have separable per-ts oi difiex ezit travel operetecl simultaneously by e eoou Aoeomline to euotlier iesture oi the invention the: elutelz mec "we an associated broke men: are mounted-m close to the blSQ plate of the machine with the sbiiteble iterte movable horizontellv.

@tlxer features and advantages of the present invention be described in detail hereinafter euol pointed out in the accompanying claims.

T wo constructions according to thepresent luveution ere shown asexples in the time. I

.i iig'l l shows e side elevation ol the 'memee,w e l t Pie. 2 is e side elevation of the elutehmeohe= mm partly in section, end w I Fle'lisepleu. v

Fig. t is e separate emboemt-of the mechvvithflxed brelie end with builerirod to loosely fitted adjecentrone another 0 as to be;

take up the shocks when dlseng the clutch the drawings, e machine is shown having the lower part of its fe sustaining in suitalgle lugs a horizontal mainshalt a on which are capable of lacement, thetwo be pulleys Bi and e for ting theseck conveyor 'and the s evglng devloe respectively. Both belt pulleys are.

- driven through clutches-whereof the ble 1 w of friction surfaces on the pulleys rresponding friction discs 4 and o fixed a theta. Perpendicular w the me.

n which is suoli that clutch l (1 seek sewit be (i is but also in the hofizontal position, is arranged the control sheila 1. On this is fixed'th'e lever g which by means of a rod h is connected with a pedal i and can be'roeked by the operatiop thereof. To transmit force between the rod 5 and having an; e 31 m lug surface 0 against which rests the abutment o1 firmly connect with the shaft. Between time levels 2 and 9 there is e torsion spring eomieetioii 75 the double lever l-h me be rotated at certain amount with respect to the lever genial the shaft f eeeuis time action of the\ spring it. in the position so rest, the abutment: @1 rests egeiust'the projection 0, so that the ee= time of t me series 1; ceueelleel. A lever a meet on the t j eete, through e, eouueetionrod ea, an eeellleting lever 2 and e further for-l: lever v m, on tile belt pulleys eml shifts it to operate the see heed clutch e, e.

in oroler to M able to bring the belt pulley e eulelslv to rest elter eli-eengeging the coupling, there is provided e brake lever s which is relieved tromslieelzs by the spring or. Ii" it be desired to fix lever rigidly, as she in Fig. i, it is w necessary to m the intermediate roe oi elastic, that is, to oonstruet it as e shoelrelaiug red.

Eu orolerto permit it later eolj ent eucl teu= trio of the shaft 2 e is a: lever on, on which rats Ki it there is provided on the of the spring n, which isi'otatehle to e ee Y extent srouml the shaft? rious positions on the seent t by means @flmlts or in any other 11. .5.

The method ot as follows: If, after a seek is pleeeai on the conveyor device,

m to.sterttl1ehin,tliet is depressed. This movement is ttted through mt ,n sud the ball joint Hto the lever g. The shell: I? is thereby rockeoabout its evils; The shift lever in oft-lie eouveyor clutch rotates about its pivo axis and engages this elutohby lore the belt'pulle ton to the correspondlnglclutehd; A e same time, the lever 'q is also roekeci and, through the transmis 'sion member at, the lever-sf, and the shift lever n operation of the eutus-ls and can be fixed in We of the head clutch brings the second beltv elutoh the latter clutehw come into con ulley nearer to its corresponmng clutch halt e;

zis

: elements having differ between disengaged a elevated position thereon,

tact and engagement, and consequently the conveyor band will come into operation. If now the pedal i be still further depressed, the double lever l, 11 is not moved further as the belt pulley b controlled thereby has already had its travel arrested by the coupling half 41, while, on the other hand, on the further rotation of the shaft 2, the,

lever q is rocked against the action of the spring 11 and, by means of the parts (11, r and shift-lever n, the belt pulley c of the sewing head olutch'is moved further until it comes into engagement with its corresponding coupling half e and also puts the sewing device intooperation after the conveyor.

In order again to stop the machine,-the pedal i is slightly released when first the belt pulley c of the sewing head, cler the influence of the spring n, moves slightly to the left so that it disengages from'the corresponding friction disc e, and bears instead against the brake block. of the lever s, consequently stopping in a short time. If the pedal be still further released, the abutment 01 bears against the projection 0 so that the spring n is no longer operative. The lever l rctates further under the action-of the spring n and brings the belt pulley b of the conveyor clutch out of engagement with its corresponding frictionpulley d. At the same time, the lever l with the brake block m thereon moves upwards and bears on the brake ring disposed on the belt pulley b, whereby this latter is braked and the conveyor device is also rapidly brought to rest. Thus the two clutehes are disengaged successively in reverse order to their engagement by virtue of the different travel amplitudes of the simultaneously operated shift levers. V

I claim:

1, A sack sewing machine comprising a stationary sewing head, a conveyor arranged to convey saclgs in one direction past said head, a horizontal shaft forming a common drive for the conveyor and the sewing head, two clutches on said shaft each having a element for connecting the shaft to the sewing head and the conveyo respectively, the shiftable int lengths of idle travel d engaged positions, and means for operating the clutches simultaneously.

2. A sack sewing machine comprising a base plate, a stationary sewing head mounted in an a conveyor arranged below said stationary head to convey sacks in one direction past the same, a horizontal shaft journalled in close proximity to the base plate and forming a common drive for the conveyor and sewing head, two clutches on said shaft each having a shiftable and an axially fixed element for connecting the shaft to the sewing head and the conveyor, the shiftable elements having different lengths of idle travel between disengaged and engaged positions, and means for operating the clutches simultaneously.

3. A sack sewing machine comprising a base plate, a stationary sewing head thereon, a conveyor mounted in said base plate and arranged to convey sacks in one direction past said-head, a horizontal shaft journalled in close proximity to the base plate and forming a common drive for the conveyor and sewing head, two clutches on said shaft each having a shiftable and an axially fixed element for connecting the shaft to the sewing head and the conveyor, the shiftable ele- -ment of the conveyor clutch, and means shiftable and an axially fixed.

ment of the conveyor clutch having a shorter idle travel between disengaged and engaged position than the shiftable element of the sewing head clutch, and -means for operating the clutches simultaneously.

4. A machine according to claim 3 in which the means for operating the clutches simultaneously comprises a clutch actuating shaft, a longer lever on said shaft for actuating the conveyor clutch, and ashorterlever on said shaft for actuating the sewing head clutch.

-' 5. A sack sewing machine according to claim 3, comprising also a yielding brake shoe co-opcrating with the shiftable element of the sewing head clutch, and a brake shoe co-operating with the axially fixed element of the conveyor clutch and positively applicable by means of the shift lever of that clutch.

6. A sack sewing machine according to claim 3,.comprising also a fixed brake shoe co-operating with the shiftable element of the sewing head clutch, a brake 'shiie;.-co-operating with theaxially fixed element of the conveyor clutch, and an elastic connection between the last mentioned brake shoe and the shift lever of the conveyor clutch.

'1. A sack sewing machine comprising a base plate, a stationary sewing head thereon, a conveyor mounted in said base plate and arranged to convey sacks in one direction past said head, a horizontal shaft journalled in close proximity to the base plate and forming a common drive for the conveyor and sewing head, two clutches on said shaft each having a shiftable and an axially fixed element for connecting the shaft to the sewing head and the conveyor, the shiftable eleclutch having a shorter idle travel between disengaged and engaged-position than the shiftable element of the sewing head for operating the clutches simultaneously, said means comprising a clutch actuating shaft having a shorter lever fixed thereon for actuating the sewing head clutch, a longer lever for actuating the conveyor clutch, and a resilient connection between said shaft and the conveyor clutch lever.

8. A sack sewing machine comprising a base plate, a stationary sewing head thereon, a conveyor mounted in said base plate and arranged to convey sacks in one direction past said head, a horizontal shaft journalled in close proximity to the base plate and forming a common drive for the conveyor and sewing head, two clutches on said shaft each having a shiftable andan axially fixed element for connecting the shaft to the idle travel between disengaged and engaged posi-.

tion than the shiftable element of the sewing head clutch, and means for operating the clutches simultaneously, said means comprising a clutch actuating shaft, a lever loosely mounted on said shaft for actuating the conveyor clutch, a lever fixed on said shaft for actuating the sewing head clutch, and a spring abutting between the conveyor clutch lever and the clutch shaft biasing said lever into clutch engaging position. j

9. A machine according to claim 8 comprising also an abutment for the spring on the clutch shaft, which abutment is movable to adjust the action of the spring.

FRITZ EBERT. 

